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GH4169机匣安装座环形焊缝多轴疲劳寿命预测模型

吴振豪, 刘鹏飞

吴振豪, 刘鹏飞. GH4169机匣安装座环形焊缝多轴疲劳寿命预测模型[J]. 焊接学报, 2024, 45(7): 101-108. DOI: 10.12073/j.hjxb.20230609002
引用本文: 吴振豪, 刘鹏飞. GH4169机匣安装座环形焊缝多轴疲劳寿命预测模型[J]. 焊接学报, 2024, 45(7): 101-108. DOI: 10.12073/j.hjxb.20230609002
WU Zhenhao, LIU Pengfei. Prediction model of multiaxial fatigue life of circular weld of GH4169 casing mounting seat[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(7): 101-108. DOI: 10.12073/j.hjxb.20230609002
Citation: WU Zhenhao, LIU Pengfei. Prediction model of multiaxial fatigue life of circular weld of GH4169 casing mounting seat[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(7): 101-108. DOI: 10.12073/j.hjxb.20230609002

GH4169机匣安装座环形焊缝多轴疲劳寿命预测模型

详细信息
    作者简介:

    吴振豪,硕士,工程师;主要研究方向为航空发动机结构强度设计;Email: wzh413611533@sina.cn

    通讯作者:

    刘鹏飞,学士,高级工程师;Email: liupengfei2013@sina.com.

  • 中图分类号: TG 405

Prediction model of multiaxial fatigue life of circular weld of GH4169 casing mounting seat

  • 摘要:

    针对航空发动机机匣安装座焊接结构在复杂载荷作用下的多轴疲劳寿命研究,提出了一种基于临界平面法的多轴疲劳寿命预测模型研究方法. 首先,根据机匣安装座环形焊缝的结构特征,设计了一种可以实现双轴拉伸的疲劳试验件,分别在不同载荷级和双轴比下进行双轴拉伸疲劳试验,然后,基于临界平面法的Findley和Matake准则下分别预测疲劳寿命. 结果表明,两种准则并不能很好地预测不同双轴比下的机匣安装座环形焊缝疲劳寿命,通过对Matake准则下的疲劳寿命预测模型进行调整,引入双轴比γ对其进行修正,最终建立了能综合考虑不同双轴比影响的双轴拉伸疲劳寿命预测模型,预测结果均在3倍分散带以内.

    Abstract:

    Aming at multiaxial fatigue life prediction model research on the welded structure of aviation engine casing mounting seat under complex loads, a fatigue life prediction model based on critical plane method is proposed. Firstly, based on the structural characteristics of circular weld of the casing mounting seat, a fatigue biaxial tensile specimen was designed, and biaxial tension fatigue tests were conducted at different load levels and biaxial ratios. Then, based on the critical plane method of Findely and Matake criteria, the fatigue life was predicted separately, and the results showed that the two criteria could not effectively predict the fatigue life of circular weld of the casing mounting seat under different biaxial ratios, by introducing the biaxial ratio γ to adjust the fatigue life prediction model under the Matake criterion, a biaxial tensile fatigue life prediction model was established that can comprehensively consider the effects of different biaxial ratios, and the predicted results are within a 3-fold dispersion band.

  • 图  1   双轴拉伸试验件(mm)

    Figure  1.   Geometry of cruciform specimen

    图  2   双轴拉伸试验件实物图

    Figure  2.   Physical image of cruciform specimen. (a) front; (b) opposite

    图  3   MTS Biaxial平面双轴试验系统

    Figure  3.   MTS Biaxial Test Frame

    图  4   双轴拉伸试验件S-N曲线

    Figure  4.   S-N Curve of cruciform specimen

    图  5   等效应力准则下疲劳寿命预测结果

    Figure  5.   Fatigue life prediction with equivalent stress

    图  6   等轴加载试验件断裂过程示意图

    Figure  6.   Fracture process of specimen under equiaxial loading. (a) N = 601 220; (b) N = 630 520; (c) N = 635 874; (d) N = 643 599

    图  7   非等轴加载试验件断口对接示意图

    Figure  7.   Fracture docking of specimen under unequiaxial loading. (a) γ=0.8;(b) γ=0.6

    图  8   试验件宏观断口形貌

    Figure  8.   Macroscopic fracture morphology of specimen

    图  9   Findley准则确定临界平面

    Figure  9.   Searching critical plane by Findley criteria

    图  10   Findley准则下疲劳寿命预测结果

    Figure  10.   Fatigue life prediction with Findley criteria

    图  11   Matake准则确定临界平面

    Figure  11.   Searching critical plane by Matake criteria

    图  12   Matake准则下疲劳寿命预测结果

    Figure  12.   Fatigue life prediction with Matake criteria

    图  13   焊缝路径等效应力σem对比

    Figure  13.   Comparison of equivalent stress σem on the weld

    图  14   修正的Matake准则下疲劳寿命预测结果

    Figure  14.   Fatigue life prediction with modified Matake criteria

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  • 期刊类型引用(1)

    1. 李劲风,李昊然,王正安. 铝锂合金组织-性能相关性及新型铝锂合金设计. 中国材料进展. 2022(10): 796-807 . 百度学术

    其他类型引用(3)

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出版历程
  • 收稿日期:  2023-06-08
  • 网络出版日期:  2024-03-03
  • 刊出日期:  2024-07-24

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